Ceramics-Silikáty 51, (2) 98 - 101 (2007) |
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RHEOMETRY OF CONCENTRATED CERAMIC SUSPENSIONS - STEPS FROM MEASURED TO RELEVANT DATA - PART 2. ROTATIONAL VISCOMETER WITH COAXIAL CYLINDERS - BINGHAM MODEL
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Andertová Jana 1, Moravec Jiří 2, Rieger František 2,
Švarcová Kateřina 1
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1 Institute of Chemical Technology, Prague, Department of Glass and Ceramics, Technická 5, 166 28 Prague, Czech Republic
2 Czech Technical University in Prague, Faculty of Mechanical Engineering, Department of Process Engineering,
Technická 4, 166 07 Prague, Czech Republic
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Keywords: Rheology, Ceramics, Suspension, Clay, Rotational viscometry, Bingham model
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The knowledge of flow behavior of ceramic suspensions is an important condition for control of ceramic wet processing. The
flow behavior can be stated by the rheological measurements. The aim of the measurements was to obtain the flow curve and
to propose suitable and simple rheological model for the flow behavior description. The Bingham model is the simplest model
used for description of rheological behavior of plastic ceramic materials. Using this model, the relation of shear stress τ and
shear rate γ can be expressed by the following relation: τ = μpγ + τ₀ for ιτι ≥ τ₀ where τ₀ is the yield stress and μp stands
for plastic viscosity. The several arrangements of rotational viscometer method with coaxial cylinders were used in rheological
measurements. The procedure of experimental data evaluation from rotational viscometer with coaxial cylinders to obtain
parameters τ₀ and μp is presented. ι |
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